docs: clarify usage of worker-rspack-loader

[chenjiahan]

Summary

Updates the documentation for using Web Workers to includes examples and clarifications.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR updates the documentation for using Web Workers by clarifying how to use the worker-rspack-loader as an alternative to the deprecated worker-loader.

• Updated guidance and examples for configuring worker-rspack-loader in rsbuild.config.ts.
• Added code examples demonstrating how to import and instantiate a Web Worker using worker-rspack-loader.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
website/docs/zh/guide/basic/web-workers.mdx	Updated Chinese docs to provide clearer instructions and examples for transitioning from worker-loader.
website/docs/en/guide/basic/web-workers.mdx	Updated English docs to clarify usage of worker-rspack-loader and include example configuration and usage code.